XCB

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XCB
Xcb logo.svg
開發者 Jamey Sharp, Josh Triplett, Bart Massey
穩定版本 1.10 / 2013年12月22日;8個月前 (2013-12-22) [1]
操作系统 POSIX
类型 X Window core protocol development library
许可协议 MIT
網站 xcb.freedesktop.org

XCB(X C Binding)是一套以 C語言撰寫,並用於綁定(Binding) X Window System之上。XCB是一套免費的軟體,目標在於取代 Xlib。這個計劃開始於2001年,作者是Bart Massey.

理念[编辑]

XCB 主要目標是:

  • 減輕函式庫的大小與複雜度;
  • 可直接存取 X11 protocol.

範例[编辑]

/* Simple XCB application drawing a box in a window */
 
#include <xcb/xcb.h>
#include <stdio.h>
#include <stdlib.h>
 
int main()
{
  xcb_connection_t    *c;
  xcb_screen_t        *s;
  xcb_window_t         w;
  xcb_gcontext_t       g;
  xcb_generic_event_t *e;
  uint32_t             mask;
  uint32_t             values[2];
  int                  done = 0;
  xcb_rectangle_t      r = { 20, 20, 60, 60 };
 
                        /* open connection with the server */
  c = xcb_connect(NULL,NULL);
  if (xcb_connection_has_error(c)) {
    printf("Cannot open display\n");
    exit(1);
  }
                        /* get the first screen */
  s = xcb_setup_roots_iterator( xcb_get_setup(c) ).data;
 
                       /* create black graphics context */
  g = xcb_generate_id(c);
  w = s->root;
  mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
  values[0] = s->black_pixel;
  values[1] = 0;
  xcb_create_gc(c, g, w, mask, values);
 
                       /* create window */
  w = xcb_generate_id(c);
  mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
  values[0] = s->white_pixel;
  values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS;
  xcb_create_window(c, s->root_depth, w, s->root,
                    10, 10, 100, 100, 1,
                    XCB_WINDOW_CLASS_INPUT_OUTPUT, s->root_visual,
                    mask, values);
 
                        /* map (show) the window */
  xcb_map_window(c, w);
 
  xcb_flush(c);
 
                        /* event loop */
  while (!done && (e = xcb_wait_for_event(c))) {
    switch (e->response_type & ~0x80) {
    case XCB_EXPOSE:    /* draw or redraw the window */
      xcb_poly_fill_rectangle(c, w, g,  1, &r);
      xcb_flush(c);
      break;
    case XCB_KEY_PRESS:  /* exit on key press */
      done = 1;
      break;
    }
    free(e);
  }
                        /* close connection to server */
  xcb_disconnect(c);
 
  return 0;
}

注釋[编辑]

  1. ^ Danjou, Julien. [Xcb] [ANNOUNCE] libxcb-1.10. xcb mailing list. 2013-12-22 [2013-12-22]. 

外部連結[编辑]